cgesc2-f(3)

cgesc2.f –

Synopsis

Functions/Subroutines

subroutine cgesc2 (N, A, LDA, RHS, IPIV, JPIV, SCALE)
CGESC2 solves a system of linear equations using the LU factorization with complete pivoting computed by sgetc2.

Function/Subroutine Documentation

subroutine cgesc2 (integerN, complex, dimension( lda, * )A, integerLDA, complex, dimension( * )RHS, integer, dimension( * )IPIV, integer, dimension( * )JPIV, realSCALE)

CGESC2 solves a system of linear equations using the LU factorization with complete pivoting computed by sgetc2.

Purpose:

 CGESC2 solves a system of linear equations
 A * X = scale* RHS
 with a general N-by-N matrix A using the LU factorization with
 complete pivoting computed by CGETC2.

Parameters:

 N is INTEGER
 The number of columns of the matrix A.

 A is COMPLEX array, dimension (LDA, N)
 On entry, the LU part of the factorization of the n-by-n
 matrix A computed by CGETC2: A = P * L * U * Q

LDA

 LDA is INTEGER
 The leading dimension of the array A. LDA >= max(1, N).

RHS

 RHS is COMPLEX array, dimension N.
 On entry, the right hand side vector b.
 On exit, the solution vector X.

IPIV

 IPIV is INTEGER array, dimension (N).
 The pivot indices; for 1 <= i <= N, row i of the
 matrix has been interchanged with row IPIV(i).

JPIV

 JPIV is INTEGER array, dimension (N).
 The pivot indices; for 1 <= j <= N, column j of the
 matrix has been interchanged with column JPIV(j).

SCALE

 SCALE is REAL
 On exit, SCALE contains the scale factor. SCALE is chosen
 0 <= SCALE <= 1 to prevent owerflow in the solution.

Author:

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Date:

September 2012

Contributors:

Bo Kagstrom and Peter Poromaa, Department of Computing Science, Umea University, S-901 87 Umea, Sweden.

Definition at line 116 of file cgesc2.f.

Author

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